Collaborations between the law enforcement and mental health communities have become vital as law enforcement officers are often first-line responders in crisis situations involving individuals with mental illnesses. A nationally recognised example of a pre-booking jail diversion program, the Crisis Intervention Team (CIT) model, was developed in 1988 following a fatal police shooting of a person with a history of a mental illness. The model is a close collaboration among law enforcement, the mental health system, and advocates. CIT programs provide specialised training for police officers to assist them in safely and effectively responding to individuals with mental illnesses and obtaining appropriate services that will adequately address these individuals' needs in lieu of incarceration when appropriate. This book examines the CIT model and the reasons why it is a unique and important collaboration between law enforcement and mental health.